Rolling lift bridge



, Jan. 4,92'7. 1,613,504

R. DAYDE ET AL.

ROLLING LIFT BRIDGE Patented Jan'. 4, 1927.,

REN .DAYDE AND JACQUES DAYDE, or rAms, FRANCE.

ROLLING LIFT BRIDGE.

Application filed May 2, 1925, .Serial No.

Rolling lilit bridges are generally actuated by means of motors and mechanism carried by the bascule and driving two over--v hung pinions 'which co-act with two racks supported by two trestlcs disposed re,fpcc tively one on each side of the bascule.

Each ot these actuating pinions is coupled with a gear Wheel of large diameter' driven by the mechanism carried on the bascule, and the gear Wheel is disposed between the bascule and the upper member ot the trestle suliporting the neighbouring rack.

The object of the present invention is a construction of rack-supporting trestle which enables these gear Wheels to be easily put in place or removed'. rIhe invention consists in making one part of each rack and of the member supporting it movable and enabling it to be readily shifted so that the gear Wheels can be removed laterally.

These members having removable parts can be constructed in various Ways; by Way of example, but not of limitation, and to facilitate the understanding of the description, a construction according to the invention is shown in the appended drawings.

Figure 1 is an elevation of the side of the bridge when the bascule is fully raised.

Figure 2 is the corresponding end view.

The bridge comprises a bascule or leaf l, shown in raised position, Which is counterbalanced by a oounteriveight 2. During raising or lowering, the bascule rests and rolls by its sector 4 upon a bed 3 as usual in bridges of this type. Movement is brought about by pinions at the centre of the sector l actuated by a motor and co-acting with the fixed racks 5 carried by suitable trostles G.

In bridges `of this type the motor and rclated parts are generally placed within the bascule and the actuating pinions 8 and 9 are overhung. Motion is transmitted to these pinions from the motor shaft 7, gears 7', 20, 20, 11', 11, 8 to the gears l() which are `of relatively large dimensions. These toothedV Wheels .are too large to be removed from their shaft 15 by sliding them in the direction of the arrows f, f because they Would come up against the racks and their supporting members 16, and for this reason the 27,464, and in France February 4, 1925.

installation or removal of the whole actuating mechanism is very dilicult.

In the arrangement forming the object of the present invention this diiiiculty is overcome by the use of racks and supporting members 16 not made in a single piece, but having a part which is easily removable to leave a sufiicient gap for the passage of the gear Wheels. i

In the example shown in the drawings, it is the rear ends of the racks Which are thus removable. The racks 5 and the members 16 which support them end in'an overhung removable part l2. The rack does not su pport lthe Weight of the bridgev and is onlyY subjected to horizontal stresses, so that'mechanical construction of this overhung removable part presents no particular technical diiiiculty. It can be seen from Figure 1 that when the projecting part 12 is removed there is nothing in the Way of removal of the gear Wheels 10 and l1.

It is obvious that the front instead of the rear end of the rack and supporting girder might be overhung and made removable in the same Way. Or the removable part could be disposed between the vertical struts 13 and le of the trestle.

What We claim is l. In a rolling lift bridge having a bascule in rolling contact With a bed, a rack, a pinion meshing With the rack and carried by the bascule, driving means for the pinion, the rack having a removable portion to permit demounting the driving means.

2. In a rolling lift bridge having a bascule in rolling contact With a bed, a rack, a member supporting the rack, a pinion meshing with the rack and carried by the bascule, driving means for the pinion, the rack and supporting member having a removable portion to permit demounting the vdriving means.

3. In a rolling lift bridge having a bascule in rolling contact with a bed, a rack, a trestle supporting the rack, a pinion 1neshing with the rack and carried by the bascule, driving means for the pinion, the rack having an overhung and removable portion to permit -demounting the .driving means.

4. In a rolling lift bridge having a baseule in rolling Contact with a bed, treaties beside the bascule, members upon the trestles and overhanging the same, racks upon the members, pinions carried by the bascule and meshing lWith the racks, gear wheels coaxial with the pinions and fastened therei0, driving means for Jche gear Wheels, the

members having their overhung portion removable together with the portion of the racks thereon..

In testimony whereof We have signed our names to thsspeeifieation.

REN DAYDE. JACQUES DAYDE. 

